Image of a brain cheering

CryptoHack

A free, fun platform for learning modern cryptography

Image of a cloud pouring information into a head

Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

Level up image of a warrior

Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

New ideas in development

Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 Meguminz 1890
#2 convyu 1780
#3 cahidenes 1530
#4 anatolia 1430
#5 BroccoLee 1250
Recent Solves
Inferius Prime AdamiyaPavel
Sharks on the Wire submarine
Bytes and Big Integers Aterlone
Flipping Cookie Bitraven
RSA Decryption AdamiyaPavel
Recent Solutions
Invariant ispo 0
Modular Binomials alienkeric 0
Encoding Challenge konnosT 0
Gotta Go Fast fssl 0
Bruce Schneier's Password fssl 0

Level Up

level up icon

You are now level Current level